Surfboard fin



FIG. 1 is a perspective view of the surfboard fin from the top right;

FIG. 2 is an elevational view thereof from the front;

FIG. 3 is an elevational view thereof from rear;

FIG. 4 is an elevational view thereof from the right;

FIG. 5 is an elevational view thereof from the left;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

CLAIM The ornamental design for a surfboard fin, as shown and described.